Eric Ries's The Lean Startup provides a methodology for entrepreneurs to build successful businesses by focusing on validated learning and rapid iteration. The book emphasizes a scientific approach to innovation, using the Build-Measure-Learn feedback loop to test assumptions and adapt strategies quickly. Key concepts include minimum viable products (MVPs), innovation accounting, and pivoting. Ries advocates for continuous experimentation and a data-driven approach to decision-making, even within established companies. The text incorporates numerous real-world examples to illustrate these principles and techniques.